Fix exec and eval commands

[shhlife]

There are two nodes which will be caught by ComfyUI's upcoming security measures. They're both innocuous, but I need to resolve them. The gtUIBaseRagModule.py issue should be resolvable - but I'm not sure yet how to solve the gtUICodeExecutionTask.py one.

Security warnings found:
nodes/rag/gtUIBaseRagModule.py:34:24: S307 Use of possibly insecure function; 
consider using `ast.literal_eval`
   |
32 |             # Try to evaluate the string as a dictionary
33 |             try:
34 |                 return eval(f"dict({params})")
   |                        ^^^^^^^^^^^^^^^^^^^^^^^ S307
35 |             except Exception:
36 |                 # If evaluation fails, try to parse it as JSON
   |

nodes/tasks/gtUICodeExecutionTask.py:233:5: S102 Use of `exec` detected
    |
[231](https://github.com/griptape-ai/ComfyUI-Griptape/actions/runs/12971183494/job/36177302149#step:3:245) | """
232 |     # Compile and execute the code
[233](https://github.com/griptape-ai/ComfyUI-Griptape/actions/runs/12971183494/job/36177302149#step:3:247) |     exec(wrapped_code, exec_globals, exec_locals)
    |     ^^^^ S102
[234](https://github.com/griptape-ai/ComfyUI-Griptape/actions/runs/12971183494/job/36177302149#step:3:248) |
235 |     # Extract the dynamically created function
    |


We will soon disable exec and eval, and multiple statements in a single line, so
this will be an error soon.

[shhlife]

I fixed the gtUIBaseRagModule error - so that's handled.

But not sure how to handle gtUICodeExecutionTask.

I might just make a bunch of options for string manipulation instead and see if that handles most situations